I then marked the bearing on the bottom side and used the trammel to cut a 3/8" deep recess. I cut the circle for the turn table with a 1/2" diameter 2 1/2" long bit in 6 passes (about 1/4" cut per pass). I could have made just one trammel and used it for both the turntable and large table, but it would have been cumbersome to have a 32" long trammel swinging around a 24" table. There are many types of circle cutting jigs out there, this simple style works for what I wanted to do. I then laid out the 1/2" measurement grid on the plywood and once that was done, used a hole saw to cut a clearance hole for the router bit. After mounting the router, I installed a v-groove bit and used it to mark the router bit center on the plywood by plunging the router down (without power). I used 1/2" plywood cut to the width of my router and marked the holes for the mounting screws. While the glue was drying, I made two trammels to cut the circles. You can also use some sturdy wood stock and wrap it in wax paper or plastic wrap to keep the glue from sticking to it. As it is not uncommon for glued up tops to want to buckle a bit while being clamped, I used 1" square aluminum tubes clamped to either side to keep the glue-up flat. I used a biscuit joiner primarily for alignment and it is entirely optional. The 4 pieces for the turntable were glued together as shown in the first image.
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